Our expert says:
Vasculitis is just another name for inflammation of blood vessels. Vasculitis can be caused by medication, cancer, certain infections and you do get hereditary kinds. See http://www.medicinenet.com/vasculitis/article.htm
Your dad's is probably due to the cancer, so you should try and find out what the cause of your mother's vasculitis is and whether this is one of the possible hereditary diseases.
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